Doh! It would help if I put where I got it from - https://www.waterbabybirthingpoolhire.co.uk
They are really nice to deal with. And I think if you go over the five weeks you get the next week free, which was good for us as even I gave birth within the five weeks my DS ended up in NICU for a few days so that meant we couldn't get the pool packed up. They were very understanding and happy to wait until everything was okay and DS was back home safe.
I will definitely be using them this time around, but I think I might go for the La Bassine pool as I found the Birth Pool in a Box to be massive!